请问用太阳能板给带保护板的锂电池包充电，需不需要外加一个充电控制器？
太阳能板的开路电压22V，带载电压17V，功率9W
锂电池包是三节锂电池串联，自带充放电保护板、
产品要求太阳能板长期与电池包连接，电池包作为智能窗帘机的电源使用
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